In administering a calcium channel blocker to a patient diagnosed with primary hypertension, the nurse understands this is due to which mechanism of action of this medication?

A. This statement indicates a good understanding of environmental control for asthma management. Carpets can trap dust, allergens, and mold, which can trigger asthma attacks. Replacing the carpet with tile can help to reduce exposure to these allergens.
B. While dusting plants can help to reduce exposure to allergens, it is not as effective as removing potential allergens from the environment altogether. Plants themselves can also be sources of allergens, so it might be best to remove them from the home, especially the bedroom.
C. Pets, especially dogs and cats, can be a significant source of allergens for people with asthma. Keeping a pet in the bedroom can increase exposure to allergens and trigger asthma attacks.
D. Burning wood in a fireplace can produce smoke and other pollutants that can irritate the airways and trigger asthma attacks. It is best to avoid using fireplaces, especially during the winter months.

A. Propranolol is a non-selective beta-blocker that can cause bronchoconstriction, making it contraindicated for patients with asthma. It can worsen asthma symptoms by blocking beta-2 adrenergic receptors, which are important for bronchodilation.
B. Theophylline is a bronchodilator that can be used in asthma management, especially in chronic cases. While it has a narrow therapeutic index and can have side effects, it is not contraindicated in acute exacerbations. However, it’s less commonly used today due to better alternatives.
C. Prednisone is a corticosteroid used to reduce inflammation during asthma exacerbations. It is a common and appropriate medication for managing acute asthma attacks, so it does not require clarification.
D. Montelukast is a leukotriene receptor antagonist used for long-term asthma control. It helps reduce inflammation and bronchoconstriction. While it’s not a first-line treatment for acute exacerbations, it is appropriate for ongoing management and doesn’t need clarification.